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CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Stockholders’ Notes Receivable | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Temporary equity, beginning balance (shares) at Dec. 31, 2016 | 11,330,704 |  |  |  |  |
Temporary equity, beginning balance at Dec. 31, 2016 | $ 113,121 |  |  |  |  |
Increase (Decrease) in Temporary Equity |  |  |  |  |  |
Issuance of redeemable convertible preferred stock, net of issuance costs (shares) | 540,874 |  |  |  |  |
Issuance of redeemable convertible preferred stock, net of issuance costs | $ 5,427 |  |  |  |  |
Temporary equity, ending balance (shares) at Dec. 31, 2017 | 11,871,578 |  |  |  |  |
Temporary equity, ending balance at Dec. 31, 2017 | $ 118,548 |  |  |  |  |
Stockholders' equity (deficit), beginning balance (shares) at Dec. 31, 2016 |  | 3,446,137 |  |  |  |
Stockholders' equity (deficit), beginning balance at Dec. 31, 2016 | (108,733) | $ 1 | $ 8,000 | $ (521) | $ 472 | $ (116,685)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Issuance of common stock upon exercise of stock options (shares) |  | 152,691 |  |  |  |
Issuance of common stock upon exercise of stock options | 383 |  | 383 |  |  |
Issuance of common stock upon exercise of unvested stock options (shares) |  | 4,312 |  |  |  |
Issuance of common stock upon exercise of unvested stock options | 0 |  |  |  |  |
Stock-based compensation | 1,438 |  | 1,438 |  |  |
Repayment of stockholders’ notes receivable | 84 |  |  | 84 |  |
Forgiveness of stockholders’ note receivable | 437 |  |  | 437 |  |
Vesting of early exercised stock options | 122 |  | 122 |  |  |
Foreign currency translation | (70) |  |  |  | (70) |
Unrealized gain of marketable securities | 0 |  |  |  |  |
Net loss | (23,039) |  |  |  |  | (23,039)
Stockholders' equity (deficit), ending balance (shares) at Dec. 31, 2017 |  | 3,603,140 |  |  |  |
Stockholders' equity (deficit), ending balance at Dec. 31, 2017 | $ (129,378) | $ 1 | 9,943 | 0 | 402 | (139,724)
Increase (Decrease) in Temporary Equity |  |  |  |  |  |
Conversion from preferred stock to common stock (shares) | (11,871,578) |  |  |  |  |
Conversion from preferred stock to common stock | $ (118,548) |  |  |  |  |
Temporary equity, ending balance (shares) at Dec. 31, 2018 | 0 |  |  |  |  |
Temporary equity, ending balance at Dec. 31, 2018 | $ 0 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Issuance of common stock upon exercise of stock options (shares) | 395,117 | 289,077 |  |  |  |
Issuance of common stock upon exercise of stock options | $ 1,136 |  | 1,136 |  |  |
Issuance of common stock upon exercise of unvested stock options (shares) |  | 106,028 |  |  |  |
Issuance of common stock upon exercise of unvested stock options | 0 |  |  |  |  |
Conversion from preferred stock to common stock (shares) |  | 12,066,654 |  |  |  |
Conversion from preferred stock to common stock | 118,548 | $ 1 | 118,547 |  |  |
Conversion from preferred stock warrants to common stock warrants | 1,248 |  | 1,248 |  |  |
Issuance of common stock from warrants exercise (shares) |  | 121,486 |  |  |  |
Issuance of common stock from warrants exercise | 0 |  |  |  |  |
Issuance of common stock from IPO Proceeds, net (shares) |  | 8,280,000 |  |  |  |
Issuance of common stock from IPO Proceeds, net | 113,603 | $ 1 | 113,602 |  |  |
Repurchase of unvested early exercised stock options (shares) |  | (15,628) |  |  |  |
Repurchase of unvested early exercised stock options | 0 |  |  |  |  |
Stock-based compensation | 2,312 |  | 2,312 |  |  |
Vesting of early exercised stock options | 139 |  | 139 |  |  |
Foreign currency translation | 27 |  |  |  | 27 |
Unrealized gain of marketable securities | 10 |  |  |  | 10 |
Net loss | (17,453) |  |  |  |  | (17,453)
Stockholders' equity (deficit), ending balance (shares) at Dec. 31, 2018 |  | 24,450,757 |  |  |  |
Stockholders' equity (deficit), ending balance at Dec. 31, 2018 | $ 90,192 | $ 3 | $ 246,927 | $ 0 | $ 439 | $ (157,177)

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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Value of new stock classified as temporary equity issued during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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